From Shape (October 2009)
"Work out for 30 minutes a day and you'll catch half as many colds this year, according to a study in the American Journal of Medicine. That's because exercise prompts more white blood cells to circulate in your body, where they kill disease-causing invaders. Physical activity also lowers your estrogen levels, which helps explain why women who exercise regularly have a 30 percent lower risk of breast cancer."
laura i'm not too sure about this one. i get sick alot!
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